CLEVELAND

"Linda McCartney's Sixties: Portrait of an Era" is the first museum show of McCartney's photographs in the United States since her death in April 1998. The exhibit features 47 candid portraits of rock-and-roll icons, including Jimi Hendrix, the Doors, the Rolling Stones, Otis Redding and, of course, Paul McCartney and the Beatles. Through Aug. 8 at the Rock and Roll Hall of Fame and Museum, 1 Key Plaza. Sunday through Tuesday and Thursday, 10 a.m. to 5:30 p.m.; Wednesday, Friday and Saturday, 10 a.m.-9 p.m. Adults, $14.95; seniors and children ages 4 to 11, $11.50. Call 1-800-282-5393 or 1-888-764-7625, or visit www.rockhall.com.

PHILADELPHIA

The Free Library of Philadelphia owns the largest collection of Beatrix Potter's work outside Great Britain. "Beatrix Potter's Animal Friends" displays more than 150 of Potter's sketchbooks, illustrations and watercolors culled from the collection. Potter's watercolor renderings of animals served as models for the whimsical characters in her children's books. Through Oct. 29 in the library's Rare Book Department, 1901 Vine St. Monday through Friday, 9 a.m. to 5 p.m., with tours starting at 11 a.m. Free. Call 215-686-5322 or visit www.library.phila.gov.

CHICAGO

"Roy Lichtenstein: Interiors" at the Museum of Contemporary Art traces the development of the pop artist's use of invented interiors in his paintings and sculpture. Drawings, collages, prints and two monumental triptychs are displayed along with source materials--comic books, furniture ads and the artist's sketchbooks. Through Oct. 10 at the museum, 220 E. Chicago Ave. Tuesday from 10 a.m. to 8 p.m.; Wednesday through Sunday from 10 a.m. to 5 p.m.; closed Mondays. Adults, $7; seniors and students, $4; children 12 and under, free; Tuesdays, free. Call 312-280-2660 or visit www.mcachicago.org.